Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42aa8c17f4ea829e57de1ded9b6c9a97e9e0fcd98b72fb57f98b55f9f0acd46' 
  AND token = 'YIJg4wyFhWtQ11qx/+/3Ak5TfwDi5C8oiRlUlon5D+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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