Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89d8c3f0dca357ffdf85195b5a64ed22d452f1f6a814ddf9044220dc0c4ad64' 
  AND token = 'zkKVHapX0f3sIrfQWEGwXjEoMSvr3ZXBQc4uC8cWMIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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