Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a7a8b8bd0ba21e1a3a3fbecf44ea332db1cb0276391a594b3c22779b9883b1' 
  AND token = 'cb+Hel6CpVbGXWDZk9mSeYcEHwwv7BVEm0a7WKRUzLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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