Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7916afc72fcd0069a14c0d78e34bf4c98dbf3a697501f3c63f79bf274a7f80ae' 
  AND token = '/LXkvjDEAnWEL9xvtEdbvNElKx96O22mOztSPo386cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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