sed substitution variable containing "/"

I’ve got a file containing information:
eg:

Hello
START
{
toto=1
tata=2
}
STOP

I need to substitute what is between START and STOP by the content of a bash variable.
This works well using sed \c
but my variable contains "" that need to be kept, and it’s not the case.

my sed:

MY_VAR="it is 07\:00\:00"; sed -i "/START/,/STOP/c ${MY_VAR}" file 

result:

Hello
it is 07:00:00

expected:

Hello
it is 07\:00\:00

Thanks

>Solution :

I suggest to replace first all \ with \\\:

MY_VAR="it is 07\:00\:00"
MY_VAR="${MY_VAR//\\/\\\\}"
sed "/START/,/STOP/c ${MY_VAR}" file

Output:

Hello
it is 07\:00\:00