SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ac78eb2b58260bcb13dc4c928b19520c6d4426df7c38433bf807150239fa24e1' 
  AND token = 'oAgUCAZ9I/nut8F5sCOxqLeov/kCZX/Au5rGz2xygXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}