It is possible to schedule a meeting for that exact time, but its a little tricky to do. Try typing in the exact time, and clicking on that same time when it appears in the dropdown menu below.
If you cannot get it to work properly, that's ok too. You can schedule the meeting for 2:30, and start it at 2:45 without any issues from Zoom. We will not end your meeting early or have any issues with you starting your meeting earlier than the scheduled start time.
Hope that helps and please make sure to mark the solution as accepted if this information is what you needed.