Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267727dc6c44ce381399c0d0af6270403a3c9877532710b254e9970d88f4dac3' 
  AND token = 'UfCOyTca6lzUNxdwlhbgRzsC6JXVhMho+BBVTu1vlkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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