Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b349a6e4cc52b0fc77222c54981524489eaeb4e914365da9c1383ea0b486821' 
  AND token = 'QDM4PBIXSrML0oaU2CUdgUuf4LO/S769DhAOXkBAidg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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