Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dab6eac350860dd31f6a80d83a6ec6a5a9253dc1b2ca099bebd6eedbdfc7603' 
  AND token = 'BZKUlXMXkXRjfI8JxHyXXzldJwiuGO4F/8H5j6mjI0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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