SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f1078ff68c95aadf0d8bc43ca71f33cdee1cea0b9d4ef90b426e56eb8b78f19' 
  AND token = 'HzVAz/uhS5xp3bhKvvlZBgjQIiJ/aNZvYdvio5EkofM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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