Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b910fe0f5553b222c02ea507ac597587f0ddaa708e94fd411dd74611a0707768' 
  AND token = 'TbaYQ0SAVamtGiMqXWIcUibDlNZmCwlr07JCIqk25Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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