Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e2f612da40f6eec55ba19e5d3f694f7d5a249815f097e6bd696c4c345570b4' 
  AND token = 'b4BsgNZmwSWY+2Nbd3zYzNue0rn3TNGKKQgOWn7Ww58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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