Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96396170e0ad1f05670120526fb3724ac54e840510674492223630818ded09c0' 
  AND token = 'i622DZ8d8ezUc45E5ZBX81GVVE4/DZqayF7ocebr4Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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