Why is there no part indexes in mysql?

Hello, tell me, why I have in database record 200 000 , and indexes for a specific column only 10,000 only for id as many indexes how many total records checked maybe there is no index because the field is empty, but no, all fields are filled, how to be? is it possible to accurately update the indexes? because when you sort using this field of course page begins a long time to load this field with the date added
April 3rd 20 at 18:24
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