Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2440773c16da8c733af781c106c01d207c49a4ca8561f205a91924795bbd1c' 
  AND token = 'QETOaEhsPFK2LjCyUoPqRERYQHzWwT6myzizPkQEXKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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