Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53cfb0d3b0bd8718261134517b1a9c994a10ecbcd1e9788a20b4c3c108affae5' 
  AND token = 'naSpKt+YSVlED9/unUWQOMfwpqx+aj87tTDPL/viN7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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