Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762ccaf4d0c1d9c605b386bffd757d342ff19ddb00dee29cfcd651212ba8ce2e' 
  AND token = 'todGsBJixi5V0HB+1IgAnv7W7SzGP5cC//Jviz1OA1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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