Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea644b29f7511f93a5f4ee58dd4f6481e9e00d52c99b911e786196b3a4236585' 
  AND token = 'DNXZPy0KNqZC/KAVwj6lKfbW7OMIbaM0v7nC8Kd5NU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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