Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba37ea2b9bfd4d7432ba3d99faf2739f6295b73dd47518a27e1fcd5aaa02ae7' 
  AND token = 'hRrJHqlQSGnO7h0OYRDElG1dy5MsOPxW0kVzTLXEau8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}