Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9436a470b885fa28a4cb48b6a49c365964196e8a6a85b7ceef3813a66bafb1' 
  AND token = 'PYG9NvtZnIONrbWmYmO2V5ZAZ6Td+jYy4QEsyuGiHgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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