Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7356cda95ed92cddfd797366644f2300f69c6a4c7af25c6c1a10d1f106ae73cb' 
  AND token = 'EvLYoJs52bLPWd7ffl+/OYsEifEydYzlGc7naT70wuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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