Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9b8e4e64c15fbf450f3c94daef485e8fedc465663d66c263da3c1a1d0c54f3' 
  AND token = 'KCfRzsQsrPDLY4OLRdQL4GoNf0hyosniDOIOQ2tWjCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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