Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbf17f91e2652cb993ae5fe1bd0464214c2df9a24a32bf07142b7f5aa0528f8' 
  AND token = 'u8Q7Kk7sr/DxxKlh/Vyxs0AUzt3WefFwSXTE08NdjAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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