Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a78cd5529fec38d91de4977ce5de538d6fbaa32e7bc2dc900a56782931b2ed' 
  AND token = 'RnIlr+ZKbTg/rtXHHfJ85vIMa53AVDTRZs+BXgsdt2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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