Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e6843efe66f8cea477c202e9b2cf46ab60979a6a99ffd39a9ba5bb1a39eabf' 
  AND token = 'MsIZRoqk+OFoE88L8MhVg+OURo4t88nZVzNURbX9qPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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