Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cdb41f75c0fed66a5d473fb79995bae1f16a7ecbff0a55ae16f38d3f57e3b37' 
  AND token = 'TNkiBfT1MM34GlwwVBFfG9vDN55K2YUYZgZxeQ1HPuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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