Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d09892a2ccaca5bce4ccb1977e91f54590f22c8f4bfe3f56d4dc8b8ab119c3' 
  AND token = '7WBbJyf7Noh6vpkxXteUry3KAF4mvrDM4vrss/jCOV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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