Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5323ba6cfee7cd30ad9b9e46ae57ff72c271ff187c7a918ea240fc44e0e732fe' 
  AND token = 'toRkSmoFuEpnc4FW9NmQGasteQ4ZcI1X6UXa4tkcg0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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