Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af0daa48fe669602c7601c919ff1c993b116cd8b5d9254ab0dbfeff320ad967' 
  AND token = '6ORFNVz5Xubn/J1PO5aBAXf0lempHdZLW2rmdypQZvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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