Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba8058703a69ba68c806fd0d56a14ec0651263afe584bcb6d420410231d75b8' 
  AND token = 'ZN82aLCibkFUXtswyTT/UnZgK8DJJmG47t6lM80NB0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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