Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39509a67200a49753331725555fd48ba1a2210b0fa35c075bbe38fe464f0b48f' 
  AND token = 'iSp0nNa9FoHvkWc6I6O41MKcJfkzqOt+iqmvLfFwTfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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