ENGCOM-2066: [Forwardport] [BUGFIX] #15564 Generated admin API token …

…expires immediately #15744

 - Merge Pull Request #15744 from vijay-wagento/magento2:2.3-develop-PR-port-15598
 - Merged commits:
   1. 7f34b22
   2. 349d178

app/code/Magento/Webapi/Model/Authorization/TokenUserContext.php

@@ -132,6 +132,11 @@ private function isTokenExpired(Token $token): bool
  // other user-type tokens are considered always valid
  return false;
  }
+
+ if (empty($tokenTtl)) {
+ return false;
+ }
+
  if ($this->dateTime->strToTime($token->getCreatedAt()) < ($this->date->gmtTimestamp() - $tokenTtl * 3600)) {
  return true;
  }