Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb9da75c256665462e83d9f8741e7fe4c7a8bc7e2f466e267224047689fa088' 
  AND token = 'RijvhuCBEatcOlDVK70BJRgP99ozeBJAr6agODXEFeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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