Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fa806d78064974d8bf4165f0f561f3062cd87f81fd9a7847f9143639df8d43' 
  AND token = 'e827WdLNk3ubLYMsGqITRIjUxsIWmDQ5XvxqcoRBZlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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