Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7d006dbb9a573ab2e3810e6536898a4acbed95c93a3b8a35257ba50979d34d' 
  AND token = 'xx+fRYQ+Ay9BuLMxyFSAYFthpMXvsi6DMBEbbXpyctw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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