Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ec64842323f664ca32b303bc3c936fa8e21118684808f9794ff634d9920908' 
  AND token = 'K2E75oMsUVqz/b89ErGtNhOMI1PXlN0rxtg1uh6U+pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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