Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7100c97e65530303886f408238ede756af7284a51c91d92fb8cfd941e0def8a4' 
  AND token = 'DNlAYGQMozo+kpvWS4x9G5dVh5z9GpGGmfTpe0+NnM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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