Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe82a4fd485ab81b836bc20c4d8b65ce4ac2565f760b36d1604e2869ae57a87' 
  AND token = 'Uw3s37t/ibd8DZx3ij7gOfIwppWMx13jYe+nLwHw3zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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