Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322453373788ab2a53fac7bf33145771c15b108ad033b72e8519eac8c82df931' 
  AND token = 'lRt2mFsQ3Yhymf+GYuwuE5gRiH6V5kXauQcORfGDVgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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