Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d1d102f55025435a4e27f542ccb88e17356eba9b36c977c8a6f4f0feef42ef' 
  AND token = 'uuherkL7/SdRLoYCJxjTqVJSp0TkK4duOX0+WT2N4iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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