difficulty with the replace function

[Jean-Jacques Juille]

Good morning,
I work with Mysq 8.1.13,
I have a table called 'oc_setting'
In the column whose name is 'value' I have the following string:
a:1:{i:0;s:7:"2102536";}
I want to replace with the following string:
a:1:{i:0;s:7:"1234567";}
I want to do this replacement only in the row whose column whose no is 'key' is equal to:
'payline_primary_contracts'
Can you help me because I can't.
Thank you beforehand.
Note: perhaps forgive my bad English but I use Google Translate because I am French and speak English very badly.