Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b2a5653345510288027efc236b946b66ac46537806a4215771acb80b6bc0fc' 
  AND token = 'qj9jEvCUotggA/6eYax3/e3AP1IBrwmCLpCVdW952mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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