Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9693c9944671175858a223c51940783c80fb42223ff4bdc99875d22ee8f8964b' 
  AND token = 'jcxf9jEc/E87omLuKBaHP2HlU0/H83rtxBAhLgTvrXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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