Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b6fbcb10214cfd5ce72ad6d117bdfac41dcbf2f29d65f4c5f5645138de80de' 
  AND token = '6E7cUIiDbFATn/pwExM+ZjJ9kB+DX3TcOMczB5MQ6Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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