Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ed67f57c3cdc99173446d1b03d933dab5c713125b58baf8852e81420ba5cf0' 
  AND token = 'Op+LwWiOEGYioTTa+UOT6DhfH0lHVy7Wbheqg8VhMd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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