There are tons of resources and videos available for system design and most of us have gone through it. But when it comes to 1hr interview it becomes imperative how you take lead in this process
1 Always try to take lead and direct the interview as per your strength (but also be receptive what interviewer wants to know).
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Do the basic rituals of asking requirements devising the process flow, explaining your choice with proper justification (ie why did you opt for particular DB)
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Most of us would do step 1 and 2 but one of the challenging aspect is handle follow up questions. This needs some practice and awareness about System design concepts (you need not be a expert in this, but try to cover things horizontally and then understand in depth). It's also good to give small examples as well when you try to answer such follow up question, that not only adds substance to your answer but also ensure that interview looks more interactive and communicative.
4 Remember you have 1 hr if you can showcase or touch upon depth of couple of components (where you think you are expert) and able to handle follow up questions, you are good to clear it.