Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68d4f44ec0b528791a606694606d77c9cdabf1da9954d02a625e5432697a693' 
  AND token = 'IEQYMTNmiOowb3dBvrstodWG3HC7SrLmmwd8J5wULho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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