SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '92a2ef04142e93512650642b7a7cc1b367096f52316a7d1f407128d508c814ef' 
  AND token = '9G+HSUk1Yuhh9VEOpFpzfmzs4VLNhRKMdzA7wlwmYsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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