Data fetch for time series query from mysql

Time series SQL query fetches data from database on every refresh interval.
For example for refresh rate 5 seconds and last five minutes, it fetches data from now to now - 5m.
Every time it fetches data for entire five minutes.

Is there anyway to fetch data for delta interval (last five seconds in above example) and append to already fetched data ?

No there is no way to do delta queries

Thanks for reply.
Is there any plan for delta queries ?

There’s no plans to support that.