Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad172fc0870454e5187ee0f9c4dfe37dc67fca15e105cf8189921e24e246fa27' 
  AND token = 'B7SZJ19aeoz3rgIn75TMBRHWP1JjqFVZtPVLHGVUCAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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