Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c108ac12ab5c5e314c0b24e5521d218edc6f9dc4ab76f8dd4a64db7d534f4d02' 
  AND token = 'AnO7UCNnxIIILI5bNgzpX+RFfAAvdhukC6iAE+jbaHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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