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Based on your example above, you would first need to create the "MQL" field in Salesforce and make sure it is synced to Marketo. An alternative would be to use the "Lead Status" field in Salesforce and have a status for "MQL" for those that score over 70 and a "Nurture" status for those under 70.
You can then create a "Data value changes" trigger and add the constraint "New Value is at least 70".
The flow action could change "Lead Statues" (or your custom field) to "MQL"