Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20208b96b5dc3acfbf40be4bfe5f68d2814a05aa7b6e3e47f254e2234fe0360' 
  AND token = 'aaLhFGLOrBeEFnXvqIjadFHD/On/rVFlEzEkmYo3cf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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