Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8542ad20c1bcbb29ce13fb04647487338897d01a9ead940054020edb28aed98' 
  AND token = 'ZLxSZNn9ALZwmVzVCcw5Bbf4pe+DnzP7R+Lizddl94Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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