Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87734ccc5da954cd4807e984ab3b64efef5b296950fd6d21506119dbe55e0c35' 
  AND token = 'K2tvUJwvyNzdSSNeLurg9ApB61DNtdJozK04BFb2r4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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