Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c682f1ece7dc8ccc08f4f8cf2ae5a193eab178a225af558b3d6b5796b3b627c3' 
  AND token = '4DIE1x1b5ZDUx3+M7B9SifVc2NRqdv94wQZb57Hdo3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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