Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7812e40de173505302a6364e6dafcf6de721132361583707f76cc971c6ce1e12' 
  AND token = 'ZqjdKr7/GxbTf874YL+DpxYF41aCiatD4ei+1OrMSwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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