Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840fec49dfb4e9576f2f411a86eabba74837678423f9d80947b6d980e4f68ca1' 
  AND token = '5U3cLZHuevSiKUXSAQjl6zGVBfK6dvhRW3foav5ty6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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