SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '82981a013ba8d8f987ca3db4d7a05db6333c90279f6cf5fd3942a8cb2fd60ef9' 
  AND token = 'z9dPW/9E9H+K9+wtoGr3HLRjXfoECSjlmH/1Wfn4gDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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