Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0786b71b5e16ba4c2dfaace8e669ee41625e2849b3b3eabcc60e04d0f587bd2' 
  AND token = 'bn50xhjfMdDEo9FRkHKQjy60etgZt9bPbJ8R/fxf/dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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