SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7deae467542cb9edbde23dd7d18e9ec11fdc99749a660d7530b382c40708bd1e' 
  AND token = '7ecZsFBP7TDPwAgyMc30vmpsJ5hC3z+IJhqnf/gbFlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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