Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '355390ebda17f1c6754d9de50eae8c241d577f955dcf56a378457c7449f22627' 
  AND token = 'IfEdqC8rAnMwCkEicMaz32XisZbDcfh4jh6SA7kk8/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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