Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f160935603db01c6feeafeaa77ce2afe7433b7ef850c9b44838ae7ebd77c86' 
  AND token = '6m0SnrUW7ABqCLxkR57PC6LP+5/coXYQJHSwBO8mknc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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