Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951cac6b671a9235c083963b1806ffa29967e60bcd615fb0a005e87e5b274710' 
  AND token = 'rt72JkMNlr+8+7gS6digHfKVzw6jafEfEeHVImVZNaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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