Can I safely use contact cleaner instead of compressed air to clean stuck keys of a butterfly keyboard?

There re no contacts in there to be cleaned.

Modern keyboards sense changes in capacitance as pressure increases between printed traces on two plastic sheets, one with row (east-west) traces, one with column (north-south) traces.

Spraying solvent into an all-plastic environment will end badly.

I happen to have contact cleaner, compressed air with a cleaning agent added to it. Can I safely use the contact cleaner instead of compressed air to clean the stuck key of the butterfly keyboard?

Since some contact cleaners contain solvents that can melt plastic, no.