Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae9d5149f61d726b434c254d8cf6bde340356e54fffb2261c3da28ab138cd64' 
  AND token = 'H9iNySga1cA3QTu36qFeLy0nruIhIQuBp783zXnFIB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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