Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a16b65e38ddabb2755644a292a847883c1c3c6a4532c8c69c9b6a901c97cc20' 
  AND token = 'MGmo3L7uwSzaxi4IKOaM3zjy6l2RkPEzW6kJmF8d3NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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