Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669752f7299b16d0dffbc4745fcc7186703a2a8e45749a7c994a3eb4ff13de2e' 
  AND token = '/kyxEYdEHBU5Tq7oieFJN3YNR6FDgd9Dpl4VQll8/xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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