Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046c37617e98cd64f375d20b875ca55613cfd8b9ccc4fed678a84592d6f70f12' 
  AND token = 'LkTujx6b4h7SrX9rWfyG2ufjmgCC2aCchUUeID1JREs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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