Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca7bf0e5497c334ebb4e8f871ebe04137967d6254001610c8c744e71eeda841' 
  AND token = 'au2IsfLyADVh2rQ2tRuMAR4/q39/AmD0m6koLMprmTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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