FlushFormKey.php

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<?php
namespace Magento\PageCache\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\App\PageCache\FormKey as CookieFormKey;
use Magento\Framework\Data\Form\FormKey as DataFormKey;

class FlushFormKey implements ObserverInterface
{
    private $cookieFormKey;

    private $dataFormKey;

    public function __construct(CookieFormKey $cookieFormKey, DataFormKey $dataFormKey)
    {
        $this->cookieFormKey = $cookieFormKey;
        $this->dataFormKey = $dataFormKey;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $this->cookieFormKey->delete();
        $this->dataFormKey->set(null);
    }
}