Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a79ec04cb95b51094e16aeac8be12eef1ee1272429ccd7ea3dbf34a258b7c42' 
  AND token = 'TZRHomnUcbkm821YPl5W8mHtrMym4b1oiSpb1czb+mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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