Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad99d4ef6378f3a855bc3974dbb937b87339a9f24e97ed36365233957bd1134' 
  AND token = 'IaZiPWZ7WgWvybcgVZ3Uktt+3iwxntJ8Ci95+6TqJSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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