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Laravel simple query is taking more than 30 seconds on server

I have a Laravel,Angular,Nginx stack deployed on a server with a really good configuration.

Laravel apis on localhost are really fast but on server some days a simple select query of 10 ids return 504 while same api returns the answer in 200ms on localhost, any idea where should i check or what should i do ?

Optimizing queries will help the speed and i tryed those ways but i feel there's a overhead time delaying api calls on server some days regardless of a simple select query or a complex query.