Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47091fb7aa211267a246e0ced5b5bb5f6b922df74a7d0dfe6a6f4f03bd12b7b0' 
  AND token = 'yEPDRowfTVwnl/6EpkNDh3k3iGfSdC/or4mgsR+DxiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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