Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b09614ab946b98fdc467379cde41cd54fc41f4fff623dc607cdacabd59e4f54' 
  AND token = 'NbMZji9dL4FqZk9fZMVGzSMqJoKxqw7Vu0w60oW+KrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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