Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3900578d3c2b4f9d7e9267fd8c18e1dee5eeee16bbaed9b6831681f4758c759c' 
  AND token = '8O0cVDXzE72q4IAKJFrBxcHqtz/Z63LzFmCzU4WY4OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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