Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c9ae02e94839a4a0ec00f6b202094652b679a89cf30d4b732c4bd97d9c7f05' 
  AND token = 'L/u9arVKOi9BjR1OkebnUmSVrL3s2ZVop7BG4jQ/R1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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