AWS s3 CLi grep command with special characters

I want to copy the whole log that are stored in the AWS S3 bucket if the following line is present:

\"Key\" : 951332,\n

I've tried escaping by trying this:

aws s3 ls s3://bucket_name | grep "/\"Key/\" : 951332,/\n" --recursive

but not getting anything back, does anyone know how I can run the grep in this manner?