Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7db1eeb306a6cde5b45ead90952c29dbaf629eed026a019f399caf8255f9d0e' 
  AND token = 'w3ZZN1ua53RMgXOCFFoiqwZVDFbXnij1xIL3j7U+0NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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