Answer:
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
I am nothing really at all, Yet I am easily foundΝΎ Ignore me at your own peril, and you might end up crowned!
I have one eye. See near and far. I hold the moments you treasure and the things that make you weep.
What is lengthened by being cut at both ends?
What word looks the same upside down and backwards?
I am owned by Old McDonald.