Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8ebf9c3e79b755dabfb8b66cd52ffb6ab3230f41d42f7b71173eab92d672b5' 
  AND token = 'U2tux+7tM9ipmgN2KLmy23Ygtq0KtNXvm3QjkrNcqD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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