Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4578308111f0c922a2b74b7d08c40dc2a8ca9844ef0a51614fb443a55b9aed61' 
  AND token = 'p5f2NlU1IKpCipFVyTWwP3Ph+ucd/2A9SjkrpT8nt9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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