Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc71edbdba18a718c6800cfb62958582656b288f4df330828be45536ef205cae' 
  AND token = 'eJCG0ubOhHgZvPIcEVx9v4KfN/mnLl0DHHf2rOkhRHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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