Source

File: wp-includes/class-wp-recovery-mode-link-service.php

private function get_recovery_mode_begin_url( $token, $key ) {

		$url = add_query_arg(
			array(
				'action'   => self::LOGIN_ACTION_ENTER,
				'rm_token' => $token,
				'rm_key'   => $key,
			),
			wp_login_url()
		);

		/**
		 * Filter the URL to begin recovery mode.
		 *
		 * @since 5.2.0
		 *
		 * @param string $url   The generated recovery mode begin URL.
		 * @param string $token The token used to identify the key.
		 * @param string $key   The recovery mode key.
		 */
		return apply_filters( 'recovery_mode_begin_url', $url, $token, $key );
	}