Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2bc0d44d78ae474bf03f589a2647007404b0baef4089d6dd9c375ead98cf424' 
  AND token = 'gjytqd9TfSAS14LFTvqEnaRsGymOhn/VI8C4pdo1AkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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