Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8a8d50c45f5cb1c0f9b858c416e93fbe080d96d7ffb54bb6f11a93f030c9bc' 
  AND token = 'uLag3XULGecw7tYJvSYp6XL+Y83lHYnA9sv+P8K+/qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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