Best way to store JSON data that only ever needs to be fetched or completely overwritten

The JSON data that i want to store represents a particular data structure and when it is updated it updates the visual representation of the data structure that a user sees.

I plan on using Amazon AWS to host my little application and I'm wondering if it's good enough to simply store the JSON in one row of a MySQL database? Or should i try to use the DynamoDB NoSQL database? I also thought about parsing the JSON and storing it into different tables/columns in a MySQL database (but, this seems like too much work to me)

What is the best way to do this? A piece of the JSON will never be updated - it will either be fetched from the database in whole or completely overwritten. I plan on using php to interact with the database if that matters.