Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea9db52d0db66ce19dc153c4169ec75b4efba015d9dbc808ef6a14b5a888294' 
  AND token = 'uR6OPQj1w0sj/Q6Z9A26LbvCU6lFG5foiXJ/5ENovHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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