Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf83afc30b41320036609fd8825aaf1cb68d1dc60c2858b7f48c6275e85a134' 
  AND token = '6x47ruAr7Bl6dwd0/cN/yfHStlZ0GBKihAzGfwL89xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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