Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d34156bbf41fc64cc66b30d01e2031ca293135a36c00832fc94f5e5150ee21' 
  AND token = 'mZ8cEed0MdjhRj/RGirMSTWwmBDCqk3vFvEUOzY7GFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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