Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1c70f558fb1911ba77e634b65f716dfc9afc85918758086ef276597c422e37' 
  AND token = '3rETvf2eEKXT45/nfUeCvG4AtzfjA0ZSSGPWjFRPQDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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