Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603ca3b4320fdc00262e4baee3ba568793571cf73784e710acd5738cdb313cc6' 
  AND token = 'AEj2j0QLZulTgttDnR0ouoRyMAIbBYVRtzfbIt8puOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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