Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ca12b8737224f2336b515a1847cadcdb885934a9235cdc74634025a37c856f' 
  AND token = 'UIdBPsFRHRW4iCFRprgrPCs445fnPvwU8J5uhCCjn70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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