Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d4f798633943b6558316ea540289655f07186cdbd902a638e7d88fb54f02594' 
  AND token = 'qIuhESkX5DpQHB3ZOfxobSl6hZdlja850RStnwXYAnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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