if(ConfigAccessor.TryGetConfigValue<YourEnum>("YourOptionKey", out YourEnum value)) {
    // Value found
}

if(ConfigAccessor.TryGetConfigValue<bool>("YourOptionKey", out bool value)) {
    // Value found
}

if(ConfigAccessor.TryGetConfigValue<int>("YourOptionKey", out int value)) {
    // Value found
}

if(ConfigAccessor.TryGetConfigValue<float>("YourOptionKey", out float value)) {
    // Value found
}

KeyCode code = ActionKeyRegister.Instance.GetKeyCode("YourActionName"); 
// Or
KeyCode code = ActionKeyRegister.Instance["YourActionName"]
if(code != KeyCode.None) {
  // your action was found!
}