SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f41b4b65f83df042893f34021af307e7f664bc08fb335d1738994583105bd787' 
  AND token = 'qg2HitpuZWDxybWJxeYzMS7vQ0YIC7py9jW5k9KdXoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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