Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbfcd8bd1357a582887eb9bed4f105fd05e83a3bb0f8e2545bda3f8da5fe520' 
  AND token = 'UFJ2YfBMexfxsfM6+reJdcXzrDts9nDXFRWR9H4Bozc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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