Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f7e21b7c8d498fa305c9840498a7cbcb5eb8345785745ad635f4f4196e24bf' 
  AND token = 'WLGCuO5a5kWaXo5BM5AYVyvZk2VO/ptTaCXJ4k2mths=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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